Fan



W. MEHLHAF.

FAN.

APPLICATION FILED AIIG.29. I9I9.

1,3054? PeIenIed Feb..10,1920.

eff/zam www@ WILLIAM MEHLHAF, OF SUTTON, NEBRASKA.

FAN.

insertar.

Application lecl August 29, 1919.

To all whom t may concern.'

Be it known that I, WILLIAM MEHLHAF, a citizen of the United States, residing at Sutton, in the county or' Clay and State of Nebraska, have invented certain new and useiul improvements in Fans, of which the following is a specilication, reference being had therein to the accompanying drawing.

The invention relates t0 centrifugal fans and has for its object to provide fan of this type wherein the air from the same may be discharged tangentially or through the side casing of the lian when the tangential discharge is closed. Also to provide a dischargel opening of the ian casing with semi-spherical cap, said cap having a series oil discharge openings whereby the air will be directed to all parts of a room. Also to provide means whereby the openings ot the semi-spherical cap may be closed, thereby causing the air to be discharged from the side of the ian casing through damper controlled openings.

A further object is to provide a ian particularly adapted for driving foul air from rooms and especially fan ljor use in case of epidemics wherein the germs are carried in the air and are taken into the system of human beings through the nost is, said fan being so constructed and provided with attachments so that the air from the tangential discharge may 'be caused to spread or it so desired be force-d through a restricted opening, thereby getting the maximum force at any desired point.

lllith the above and other objects in view the invention resides in the combination and arrangement ci' parts as hereinarteln set `forth shown in the drawings, described and claimed, it being understood that changes in the precise embodiment oi' the invention may be made within the scope ot d wilat iS claimed without departing from the spirit ci the invention.

ln the drawings Figure l is a perspective view of the tan. v

Fig. 2 is a side elevation, showing the casing discharge openings and the damper means for controlling the same.

Fig. 8 is a sectional view taken on line 3?) of Fig. 2.

Fig. 4 is a sectional view taken on line 4 4. of rig. i.

Fig. 5 is a perspective view of a -tlared Specification of Letters Patent.

Patented Feb.. Ml, i929.

seri-n. ivo. 320,579.

square discharge attachment for the tangential discharge pipe.

Fig. 6 is a round iarcd discharge attachment for the tangential discharge pipe.

7 is perspective view a contracted discharge attachment for the tangential discharge.

Fig. 8 shows a modilied forni of Jfan.

Retiring to the drawings, the numeral 1 designates the casing of the `tan and 2 front and rear walls or said casing, the rear wall being provided with an intake port said intale port having disposed therein a conventional form of spider in the bearing 5 of which a shaft 6 is rotatably mounted,

said shaft carrying blades 2' oli a centrifugal fan. T ie iront wall f2 oi? the casing is provided with a series of discharge ports 8, said discharge ports being near the marginal edge of the iront wall Q where it merges into the casing 1. Extending outwardly and inwardly from the casing l and the front wall 2 is a circ-umiierentially disposed 'dange 9, said Jforming means wherebv the air passes through the discharge opening 8 after the dampers 10 have been moved so as to open the ports 8, the air will be delected inwardly to prevent the spreading` ot the air and allowing the air to be forced Ylor gi distance than in the ordinary fan. Ban s 10 are carried by a spider 11, which spider is pivotally mounted 'as at on the shaft 6. One or said dampers 10 is provided with an outi-.vardl'v and inwardly extending arm 13, the inner end of which is disposed under the fan casing 1 and is provided with a lug` 11i adapted to slide over teeth 15 carried by the 'fan 1. firm 13 has suiiicient flexibility to allow the lug 1-A to cani over the eeth 15 when the oper1 tor grasps the handle 16 to move the dainpers in one direction or another.

lllhen the dempers 10 are closed and the side delivery of the fan cut oit the discharge may be through the tangential discharge The? gential discharge pipe 17 i Aapted to rec ive attachments whereby the ai it leaves the discharge pipe 17 e spread or contacted as desired in s 1, 2 and 1i, the attachment 18 comprises a semi-spherical member having a series of discharge openings 19. .Said dis charge opening 19 being so disposed that the air as it leaves the discharge pipe 17 will be directed at diierent angles throughout the rooln, thereby effectively forcing fresh air to the room, especially when the fan is placed so that it gets its intake air froin the atmosphere outside a building. The discharge passages may be closed by means of cap 20 so as to reduce the number of openings 19, however when the discharge is through the ports 8 all of the openings 19 are closed. Attachment 18 is secured to the end of the discharge pipe 17 by ineans of a bayonet slot and lug joint 21.

Figs. 5 and 6 show attachments 18av and 18". Attachment 18'h1 has its discharge opening flared and square whereby the current of air as it leaves the discharge pipe 17 will be allowed to spread. Attachment 181 will allow the current of air to spread but will be round.

Referring to Fig. 7 the attachment 18C has its discharge opening 18d contracted thereby contracting the current of air so that the saine will carry for a considerable distance.

Referring to the modified forni of fan as shown in Fig. 8, the shaft 6 is provided with radial arnis 7, at the ends of which fan blades 7 b are attached.

The invention having been set forth what is claimed as newv and useful is 1. A centrifugal fan comprising a casing a rotating fan in said casing, one side of said casing having an intake port, the other side of the casing having a series of marginally disposed discharge ports, damper means for controlling said discharge ports, a tangentially disposed discharge pipe carried by the casing, means for closing said tangentially disposed discharge as desired, thereby allowing the fan to discharge either through the tangential discharge or the discharge ports in the side of the casing.

2. A centrifugal fan comprising a casing, a rotating fan in said casing, one side of said casing having an intake port, the other side of the casing having a series of niarqlnally disposed discharge ports, an annular flange carried by the casing adjacent the outer marginal edges of the side discharge ports and inclined inwardly for contracting the current of air as it leaves the side ports, damper means for controlling said side discharge, a tangentially disposed discharge port, means carried by said tangentially disposed discharge port whereby the discharge will be directed through a series of discharge openings located and disposed at various angles radially frein a central point and means whereby said last named series of discharge openings inay be closed for reducing the number of openings or for causing 'the fan to discharge through the discharge openings in the side of the casing.

8. A centrifugal fan comprising a casing, a rotating fan in said casing, one side of said casing; having an intake port, the other side of the casing having a series of inarginally disposed discharge ports, an annular flange carried by the casing adjacent the outer niarginal'edge of the side discharge ports and inclined inwardly for contracting the current of air as it leaves the side ports, dampers rotatably mounted on the fan shaft for controlling said discharge ports, said dainpers having a controlling lever cornprising an outwardly and inwardly extending` spring arin, said arin at its inwardly extending end engaging a series of inclined teeth carried by the casing and adapted to ride over said teeth for adjusting the dainpers to various positions and inaintaining the saine in said position, a tangentially disposed discharge pipe carried by the casing and means carried by said tangentially disposed discharge pipe whereby the air from the fan may be forced to leave the casing through the side discharge openings.

In testimony whereof l hereunto aiiix my signature.

WILLAM MEHLHAF. 

